Monument 1378Z Drain Testing Plug 100mm (4in)
Monument Drain Testing Plugs are durable, quality flexible drain plug for the plugging of drains and pipes. This plug is easy to use and are available in various sizes. Fitted with removable top caps and rubber rings.
These plugs are easy to use just place in the pipe end that is being repaired or replaced and simply turn the wing nut knob, this will depress the rubber cone, this will make it expand to seal pipe or tube end with a water tight seal.
Monument 1378Z Drain Testing Plug.
Size: 100 mm (4 in).
Capable of sealing against pressures of up to 1.97 bar / 29 psi.
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Delivery & Returns
Delivery & Returns
Delivery times vary based on the selected product option. As we operate from multiple locations, despatch may take longer if the item is stored in a specific location. Check the options below for available shipping methods, costs, and estimated delivery times.*
Click & Collect
from Paignton (TQ4 7AU)

Ready for collection
Ready to collect within 2-3 working days*
Royal Mail Tracked Standard
FREE for orders over £60

Delivery within 2-3 working days
Delivery within 4-5 working days
Royal Mail Express

Delivery within 1 working day
Delivery within 3-4 working days
UPS Standard

Delivery within 1 working day
Delivery within 3-4 working days
Please be advised that the shipping options listed above apply to mainland UK. Delivery times, shipping services, and costs may vary depending on your postcode and location. Certain areas may be subject to additional charges or extended delivery times due to logistical constraints. We recommend reviewing the available shipping options at checkout for the most accurate pricing and estimated delivery timeframe.
Easy Returns
30-day no-hassle return policy
- Return or exchange within 30 days of delivery
- Items must be unused, unfitted, and in original packaging
- Quick & easy refund or exchange process
- Dedicated support for all return enquiries
For more info, see our full returns policy.
Specifications
Specifications
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SubcategoryHand Tools
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TypePlumbing Tools
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CategoriesPlumbing Testing Equipment